On the construction of some capacity-approaching coding schemes
On the construction of some capacity-approaching coding schemes
Modern Coding Theory
IEEE Transactions on Wireless Communications
Unveiling turbo codes: some results on parallel concatenated coding schemes
IEEE Transactions on Information Theory
The capacity of low-density parity-check codes under message-passing decoding
IEEE Transactions on Information Theory
Design of capacity-approaching irregular low-density parity-check codes
IEEE Transactions on Information Theory
Efficient encoding of low-density parity-check codes
IEEE Transactions on Information Theory
Analysis of sum-product decoding of low-density parity-check codes using a Gaussian approximation
IEEE Transactions on Information Theory
Rate-compatible puncturing of low-density parity-check codes
IEEE Transactions on Information Theory
Density evolution for asymmetric memoryless channels
IEEE Transactions on Information Theory
Low density parity check codes for the relay channel
IEEE Journal on Selected Areas in Communications
Behavior of hybrid optical/RF channels over varying link distances
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
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A hybrid channel, consisting of a free space optical (FSO) link and a parallel radio frequency (RF) link, is considered. The FSO link carries most of the transmitted data while leaving only a small fraction of the data to be carried by the RF link. It is first shown that the capacity of the proposed hybrid structure is much higher than the capacity of a single FSO link. Next the performance of the hybrid channel is studied using a low density parity check code. A density evolution strategy for the hybrid channel is derived and a Gaussian approximation technique is presented. Using these techniques, the conditions for the convergence of the message passing algorithm in terms of minimum data carrying rate through the RF link are derived. Finally, numerical results showing the benefits of the hybrid channel under various channel conditions are presented.